一个字符串显示不同颜色

NSString *string = [NSString stringWithFormat:@"任务#%@",CheckNull(dic[@"task_id"])];

    NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:string];

    [str addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:NSMakeRange(str.length-3,[str length]-3)];

    cell.taskId.attributedText = str;